GZIP file Total length in C?

The last 4 bytes of the gz file contains the length So it should be something like: using(var fs = File. OpenRead(path)) { fs. Position = fs.

Length - 4; var be = new byte4; fs. Read(b, 0, 4); uint length = BitConvertor. ToUInt32(b, 0); Console.

WriteLine(length); }.

The last 4 bytes of the gz file contains the length. So it should be something like: using(var fs = File. OpenRead(path)) { fs.

Position = fs. Length - 4; var be = new byte4; fs. Read(b, 0, 4); uint length = BitConvertor.

ToUInt32(b, 0); Console. WriteLine(length); }.

Jan 12 at 7:47 Thanks Leppie... actually in my case the file will be less than 4GB... Thanks for your help... – Ummar Jan 12 at 13:54.

The last for bytes of a . Gz file are the uncompressed input size modulo 2^32. If your uncompressed file isn't larger than 4GB, just read the last 4 bytes of the file.

If you have a larger file, I'm not sure that it's possible to get without uncompressing the stream.

EDIT: See the answers by Leppie and Gabe; the only reason I'm keeping this (rather than deleting it) is that it may be necessary if you suspect the length is > 4GB For gzip, that data doesn't seem to be directly available - I've looked at GZipStream and the SharpZipLib equivalent - neither works. The best I can suggest is to run it locally: long length = 0; using(var fs = File. OpenRead(path)) using (var gzip = new GZipStream(fs, CompressionMode.

Decompress)) { var buffer = new byte10240; int count; while ((count = gzip. Read(buffer, 0, buffer. Length)) > 0) { length += count; } } If it was a zip, then SharpZipLib: long size = 0; using(var zip = new ZipFile(path)) { foreach (ZipEntry entry in zip) { size += entry.

Size; } }.

– Ummar Jan 12 at 7:40 @Ummar: Both Gabe and myself explained the 'correct' way of doing this. The above way will work, but imagine using it on 1000's of 2GB files, it will take forever. – leppie Jan 12 at 7:46 @Ummar - see @leppie's answer – Marc Gravell?

Jan 12 at 7:47 Thanks, Leppie solution worked for me perfectly... – Ummar Jan 12 at 13:55.

Public static long mGetFileLength(string strFilePath) { if (!string. IsNullOrEmpty(strFilePath)) { System.IO. FileInfo info = new System.IO.

FileInfo(strFilePath); return info. Length; } return 0; }.

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